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Table 4 Correlations between change rates of parotid IVIM and DCE MR parameters

From: Early evaluation of irradiated parotid glands with intravoxel incoherent motion MR imaging: correlation with dynamic contrast-enhanced MR imaging

RIVIM-PARs RDCE-PARs r p value
RADC RMRE 0.103 0.550
RTTP −0.048 0.780
RWash in Rate −0.006 0.973
RD RMRE 0.191 0.264
RTTP 0.156 0.364
RWash in Rate 0.181 0.290
RD* RMRE 0.371 0.026a
RTTP 0.396 0.017a
RWash in Rate 0.251 0.139
Rf RMRE −0.079 0.647
RTTP −0.238 0.162
RWash in Rate −0.116 0.500
  1. IVIM Intravoxel incoherent motion, DCE dynamic contrast-enhanced, r Pearson correlation coefficient, RIVIM-PARsand RDCE-PARs are the change rates of IVIM and DCE MR parameters from pre-RT to post-RT, respectively, R ADC , R D , RD*, R f , R MRE , R TTP and R Wash in Rate are the change rates of apparent diffusion coefficient (ADC), pure diffusion coefficient (D), pseudo-diffusion coefficient (D*), perfusion fraction (f), maximum relative enhancement (MRE), time to peak (TTP) and Wash in Rate from pre-RT (2 weeks before radiotherapy) to post-RT (4 weeks after RT), respectively
  2. adenotes a significant correlation between the change rates of IVIM and DCE MR parameters